Crossword Genius

Horrified grimace right away showing stress (5)

Ross

I believe the answer is:

ictus

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'stress' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

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(Other definitions for ictus that I've seen before include "recurrence of disease results" , ""fit"" , "Is cut (anag.)" , "Metrical stress" , "Sudden attack" .)

I've seen this clue in The Times.
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